. >> i think he was guilty of excesses of punishment >>> "america tonight"s michael oku with a mixed blessing. i'm joie chen. st. patrick's church, washington d.c. may seem like an obvious place for the papal visit. it's the oldest parish in the capitol hill and president's and other a list guests. when pope francis visits, it will be a first, even for this church. that might not be surprising when you consider that pope francis, in his short tenure as leader of 1.2 billion catholics has been a ground breaker. a game changer for the church. in our special week of coverage "america tonight" seeks to find out who pope francis is, and will look at the changes that he's made in the church. we begin with "america tonight"s sheila macvicar. >> father matthew, like pope francis is a jesuit. he's a professor of government at georgetownniversity, one of the most prestigious jesuit schools in america. he pent his adult life studying the issues of social and economic justice. closely identified with the pope. he lived in argentina when the pope was the local archbishop. poor. >> how has his lif